Malicious PDF — malware analysis report

Static analysis result for SHA-256 7193dd3f0fd96976…

MALICIOUS

PDF

74.6 KB Created: 2021-04-06 03:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2dd71e0174364467c3ba4640023a1787 SHA-1: 932d1b3cc4726801da67c574016af821d0c6301c SHA-256: 7193dd3f0fd96976c3c64e46dd2578655ca181579e2f8ca13e37ae4e0a159bff
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm for malicious purposes. Heuristics confirm the presence of malicious redirector links and a link farm, with ClamAV identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged the PDF as malicious. While no scripts were extracted, the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=diamond+color+cut+clarity+guide In PDF document text
    • http://nuwazomesesanok.mygamesonline.org/99391149378.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/a_moveable_feast_download.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/80931888434.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/non_exclusive_authority_to_sell.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/joterige/xibuxekitewatowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7573de-d6d0-4563-b320-7cc05638c742/aplicativo_para_ler_livros_gratis_offline.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_e275f9d853ed42b0a54c3d0da894a0e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08d7924-6bb3-4539-a895-c2e6d822bd41/69923946100.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/the_right_stuff_tom_wolfe_chapter_summary.pdfIn PDF document text
    • http://lugimeviguv.myartsonline.com/agilmente_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf65908-990b-4b35-beca-21102018c802/how_to_clean_lasko_ion_tower_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff78be6-f55b-43d2-a5c2-1c9df823eab7/33437180879.pdfIn PDF document text
    • http://vawekud.epizy.com/microsoft_azure_sql_data_warehouse_architecture_and_sql.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_c5b8c9de29ad4dc8bb2e0693a375d649.pdf?index=trueIn PDF document text
    • http://jibutabupax.rf.gd/nazumipakupekomo.pdfIn PDF document text
    • http://netubufetolanup.rf.gd/jegusidupigo.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_799e2f79d92f4d4982f4c81970241099.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 5184 bytes
SHA-256: 53573e375c2dabf23dc9fbf262d298ae9889de865344e78da7ce2d26edef4b0f
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 11576 bytes
SHA-256: 6f7d518631e0fcdf295e54b94917c53d46f1771f7d957ae678598255f142729f